Nucleon Spin Fluctuations and the Supernova Emission of Neutrinos and Axions
Nucleon Spin Fluctuations and the Supernova Emission of Neutrinos and Axions
In the hot and dense medium of a supernova (SN) core, the nucleon spins fluctuate so fast that the axial-vector neutrino opacity and the axion emissivity are expected to be significantly modified. Axions with ${m}_{a}\ensuremath{\lesssim}{10}^{\ensuremath{-}2}\mathrm{eV}$ are not excluded by SN 1987A. A substantial transfer of energy in neutrino-nucleon $(\ensuremath{\nu}N)$ collisions …